Who is better at collect evidence at a crime scene cops or crime scene investigators

crime scene investigators

Explanation:

Crime scenes contain physical evidence that is pertinent to a criminal investigation. This evidence is collected by crime scene investigators (CSIs) and law enforcement. The location of a crime scene can be the place where the crime took place or can be any area that contains evidence from the crime itself.

that really depend on the person and how good they are at doing there job

Explanation:

im 100% sure its all of the above.

c. flammable gases, patient lying in standing water, combustible liquids near the victim